Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word betulinus could not be parsed. Trying a normal dictionary lookup:
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† baetŭlus (bēt-), i, m., = βαίτυλος, a precious stone, round and of a dark color, a species of ceraunia, Plin. 37, 9, 51, § 135.
betŭla (also betulla), ae, f., the birch, Plin. 16, 18, 30, § 75; 16, 37, 69, § 176.
betŭlus, v. baetulus.